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The isosceles triangle has a perimeter of 7.5 m.

Which equation can be used to find the value of x if the shortest side, y, measures 2.1 m?

2 x minus 2.1 equals 7.5
4.2 plus y equals 7.5
y minus 4.2 equals 7.5
2.1 plus 2 x equals 7.5

Respuesta :

Ashraf82

The equation 2.1 plus 2 x equals 7.5 can be used to find the value of x ⇒ 4th answer

Step-by-step explanation:

In an isosceles triangle:

  • Two sides are equal ⇒ the angle between them is called the vertex angle of the triangle
  • Two angles are equal ⇒ they called the base angles

∵ The triangle is isosceles

- That means it has two equal sides

∵ The shortest side is y

∵ The length of the other two sides is x

∴ The perimeter of the triangle = y + 2 x

∵ The perimeter of the triangle = 7.5 m

- Equate the expression of the perimeter by 7.5

∴ y + 2 x = 7.5

∵ The shortest side measures 2.1 m

∴ y = 2.1

- Substitute y by 2.1 in the equation above

∴ 2.1 + 2 x = 7.5

The equation 2.1 plus 2 x equals 7.5 can be used to find the value of x

Learn more:

You can learn more about the isosceles triangle in brainly.com/question/1479138

#LearnwithBrainly

Answer:

D

Step-by-step explanation:

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